you will have to have a proper alignment done at a shop after you install the quick struts. That's a good place to start. The sound system shouldn't cause that. Check your control arms. I went in for an alignment once, 6 months after just getting one, and found that one of the rear control arms was bent, really bad. Upon getting it repaired the car drove a lot better, but I had no idea before that, or how it happened.
3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black